Display screen or portion thereof having a graphical user interface



A portion of the disclosure of this patent document contains material to which a claim for copyright is made. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but reserves all other copyright rights whatsoever.

The FIGURE is a front view of a display screen or portion thereof having a graphical user interface.

The dot-dashed broken lines depict a boundary of the display screen or portion thereof and form no part of the claimed design. The dashed broken lines depict portions of the display screen or portion thereof having a graphical user interface which form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof having a graphical user interface, as shown and described. 